Device and method for detecting defects of high-voltage cable cross-bonded grounding system

A device for determining connection defects of a high-voltage cable cross-bonded grounding system, comprising:

• an AC power supply, a signal acquisition device, an input current test device, a signal excitation coupler, an output current test device, and test sensors, wherein:
• the AC power supply is connected to the signal excitation coupler and is used for providing an alternating current with a frequency different from a power frequency and a field interference frequency for the signal excitation coupler;
• the signal excitation coupler is an annular closed loop installed on coaxial cables of a cross-bonded grounding lead which is connected to a cable cross-bonded grounding system, and is used for injecting a stable current signal into the cable cross-bonded grounding system based on the alternated current with the frequency different from the power frequency and the field interference frequency from the AC power supply;
• the AC power supply is connected to the input current test device, and the input current test device is connected to the signal excitation coupler and is used for testing an effective value and phase of a current output by the AC power supply;
• the output current test device is connected to the test sensors installed on the coaxial cables of the cross-bonded grounding lead which is connected to the cable cross-bonded grounding system, and is used for testing effective current values and phases responded by the coaxial cables of the cross-bonded grounding system at an excitation frequency, the input current test device and the output current test device are both connected to the signal acquisition device, and the signal acquisition device is used for sampling current information output by the input current test device and the output current test device.